1000 Gold:
Enter KWNOHIRO as a password at the suspicious looking pink tank in first town.

Boundbomb weapon:
Enter KKHWEEEE as a password at the suspicious looking pink tank in first town.

AirGatling weapon:
Enter GSASINRI as a password at the suspicious looking pink tank in first town to unlock the AirGatling weapon for the sub-weapon B configuration. It is for shooting down aerial targets only.

Grand Flag:
Enter ODGRITRO as a password at the suspicious looking pink tank in first town.